import { useState, FC, useRef, useEffect } from "react";
import { combine } from "@atlaskit/pragmatic-drag-and-drop/combine";
import { autoScrollForElements } from "@atlaskit/pragmatic-drag-and-drop-auto-scroll/element";
import { observer } from "mobx-react";
import { useRouter } from "next/router";
import { ChevronDown, ChevronRight, Plus } from "lucide-react";
import { Disclosure, Transition } from "@headlessui/react";
import { IProject } from "@plane/types";
// hooks
import { TOAST_TYPE, setToast } from "@plane/ui";
import { CreateProjectModal, ProjectSidebarListItem } from "@/components/project";
import { EUserWorkspaceRoles } from "@/constants/workspace";
import { cn } from "@/helpers/common.helper";
import { orderJoinedProjects } from "@/helpers/project.helper";
import { copyUrlToClipboard } from "@/helpers/string.helper";
import { useAppTheme, useCommandPalette, useEventTracker, useProject, useUser } from "@/hooks/store";
// ui
// components
// helpers
// constants

export const ProjectSidebarList: FC = observer(() => {
  // states
  const [isFavoriteProjectCreate, setIsFavoriteProjectCreate] = useState(false);
  const [isProjectModalOpen, setIsProjectModalOpen] = useState(false);
  const [isScrolled, setIsScrolled] = useState(false); // scroll animation state
  // refs
  const containerRef = useRef<HTMLDivElement | null>(null);
  // store hooks
  const { toggleCreateProjectModal } = useCommandPalette();
  const { sidebarCollapsed } = useAppTheme();
  const { setTrackElement } = useEventTracker();
  const {
    membership: { currentWorkspaceRole },
  } = useUser();
  const {
    getProjectById,
    joinedProjectIds: joinedProjects,
    favoriteProjectIds: favoriteProjects,
    updateProjectView,
  } = useProject();
  // router
  const router = useRouter();
  const { workspaceSlug } = router.query;

  const isAuthorizedUser = !!currentWorkspaceRole && currentWorkspaceRole >= EUserWorkspaceRoles.MEMBER;

  const handleCopyText = (projectId: string) => {
    copyUrlToClipboard(`${workspaceSlug}/projects/${projectId}/issues`).then(() => {
      setToast({
        type: TOAST_TYPE.SUCCESS,
        title: "Link Copied!",
        message: "Project link copied to clipboard.",
      });
    });
  };

  const handleOnProjectDrop = (
    sourceId: string | undefined,
    destinationId: string | undefined,
    shouldDropAtEnd: boolean
  ) => {
    if (!sourceId || !destinationId || !workspaceSlug) return;
    if (sourceId === destinationId) return;

    const joinedProjectsList: IProject[] = [];
    joinedProjects.map((projectId) => {
      const projectDetails = getProjectById(projectId);
      if (projectDetails) joinedProjectsList.push(projectDetails);
    });

    const sourceIndex = joinedProjects.indexOf(sourceId);
    const destinationIndex = shouldDropAtEnd ? joinedProjects.length : joinedProjects.indexOf(destinationId);

    if (joinedProjectsList.length <= 0) return;

    const updatedSortOrder = orderJoinedProjects(sourceIndex, destinationIndex, sourceId, joinedProjectsList);
    if (updatedSortOrder != undefined)
      updateProjectView(workspaceSlug.toString(), sourceId, { sort_order: updatedSortOrder }).catch(() => {
        setToast({
          type: TOAST_TYPE.ERROR,
          title: "Error!",
          message: "Something went wrong. Please try again.",
        });
      });
  };

  const isCollapsed = sidebarCollapsed || false;

  /**
   * Implementing scroll animation styles based on the scroll length of the container
   */
  useEffect(() => {
    const handleScroll = () => {
      if (containerRef.current) {
        const scrollTop = containerRef.current.scrollTop;
        setIsScrolled(scrollTop > 0);
      }
    };
    const currentContainerRef = containerRef.current;
    if (currentContainerRef) {
      currentContainerRef.addEventListener("scroll", handleScroll);
    }
    return () => {
      if (currentContainerRef) {
        currentContainerRef.removeEventListener("scroll", handleScroll);
      }
    };
  }, [containerRef]);

  useEffect(() => {
    const element = containerRef.current;

    if (!element) return;

    return combine(
      autoScrollForElements({
        element,
        canScroll: ({ source }) => source?.data?.dragInstanceId === "PROJECTS",
        getAllowedAxis: () => "vertical",
      })
    );
  }, [containerRef]);

  return (
    <>
      {workspaceSlug && (
        <CreateProjectModal
          isOpen={isProjectModalOpen}
          onClose={() => {
            setIsProjectModalOpen(false);
          }}
          setToFavorite={isFavoriteProjectCreate}
          workspaceSlug={workspaceSlug.toString()}
        />
      )}
      <div
        ref={containerRef}
        className={cn(
          "vertical-scrollbar h-full space-y-2 !overflow-y-scroll pl-4",
          isCollapsed ? "scrollbar-sm" : "scrollbar-md",
          {
            "border-t border-custom-sidebar-border-300": isScrolled,
            "pr-1": !isCollapsed,
          }
        )}
      >
        <div>
          {favoriteProjects && favoriteProjects.length > 0 && (
            <Disclosure as="div" className="flex flex-col" defaultOpen>
              {({ open }) => (
                <>
                  {!isCollapsed && (
                    <div className="group flex w-full items-center justify-between rounded p-1.5 text-xs text-custom-sidebar-text-400 hover:bg-custom-sidebar-background-80">
                      <Disclosure.Button
                        as="button"
                        type="button"
                        className="group flex w-full items-center gap-1 whitespace-nowrap rounded px-1.5 text-left text-sm font-semibold text-custom-sidebar-text-400 hover:bg-custom-sidebar-background-80"
                      >
                        Favorites
                        {open ? <ChevronDown className="h-3.5 w-3.5" /> : <ChevronRight className="h-3.5 w-3.5" />}
                      </Disclosure.Button>
                      {isAuthorizedUser && (
                        <button
                          className="opacity-0 group-hover:opacity-100"
                          onClick={() => {
                            setTrackElement("APP_SIDEBAR_FAVORITES_BLOCK");
                            setIsFavoriteProjectCreate(true);
                            setIsProjectModalOpen(true);
                          }}
                        >
                          <Plus className="h-3 w-3" />
                        </button>
                      )}
                    </div>
                  )}
                  <Transition
                    enter="transition duration-100 ease-out"
                    enterFrom="transform scale-95 opacity-0"
                    enterTo="transform scale-100 opacity-100"
                    leave="transition duration-75 ease-out"
                    leaveFrom="transform scale-100 opacity-100"
                    leaveTo="transform scale-95 opacity-0"
                  >
                    <Disclosure.Panel as="div" className="space-y-2">
                      {favoriteProjects.map((projectId, index) => (
                        <ProjectSidebarListItem
                          key={projectId}
                          projectId={projectId}
                          handleCopyText={() => handleCopyText(projectId)}
                          projectListType="FAVORITES"
                          disableDrag
                          disableDrop
                          isLastChild={index === favoriteProjects.length - 1}
                        />
                      ))}
                    </Disclosure.Panel>
                  </Transition>
                </>
              )}
            </Disclosure>
          )}
        </div>
        <div>
          {joinedProjects && joinedProjects.length > 0 && (
            <Disclosure as="div" className="flex flex-col" defaultOpen>
              {({ open }) => (
                <>
                  {!isCollapsed && (
                    <div className="group flex w-full items-center justify-between rounded p-1.5 text-xs text-custom-sidebar-text-400 hover:bg-custom-sidebar-background-80">
                      <Disclosure.Button
                        as="button"
                        type="button"
                        className="group flex w-full items-center gap-1 whitespace-nowrap rounded px-1.5 text-left text-sm font-semibold text-custom-sidebar-text-400 hover:bg-custom-sidebar-background-80"
                      >
                        Your projects
                        {open ? <ChevronDown className="h-3.5 w-3.5" /> : <ChevronRight className="h-3.5 w-3.5" />}
                      </Disclosure.Button>
                      {isAuthorizedUser && (
                        <button
                          className="opacity-0 group-hover:opacity-100"
                          onClick={() => {
                            setTrackElement("Sidebar");
                            setIsFavoriteProjectCreate(false);
                            setIsProjectModalOpen(true);
                          }}
                        >
                          <Plus className="h-3 w-3" />
                        </button>
                      )}
                    </div>
                  )}
                  <Transition
                    enter="transition duration-100 ease-out"
                    enterFrom="transform scale-95 opacity-0"
                    enterTo="transform scale-100 opacity-100"
                    leave="transition duration-75 ease-out"
                    leaveFrom="transform scale-100 opacity-100"
                    leaveTo="transform scale-95 opacity-0"
                  >
                    <Disclosure.Panel as="div">
                      {joinedProjects.map((projectId, index) => (
                        <ProjectSidebarListItem
                          key={projectId}
                          projectId={projectId}
                          projectListType="JOINED"
                          handleCopyText={() => handleCopyText(projectId)}
                          isLastChild={index === joinedProjects.length - 1}
                          handleOnProjectDrop={handleOnProjectDrop}
                        />
                      ))}
                    </Disclosure.Panel>
                  </Transition>
                </>
              )}
            </Disclosure>
          )}
        </div>

        {isAuthorizedUser && joinedProjects && joinedProjects.length === 0 && (
          <button
            type="button"
            className="flex w-full items-center gap-2 px-3 text-sm text-custom-sidebar-text-200"
            onClick={() => {
              setTrackElement("Sidebar");
              toggleCreateProjectModal(true);
            }}
          >
            <Plus className="h-5 w-5" />
            {!isCollapsed && "Add Project"}
          </button>
        )}
      </div>
    </>
  );
});
